Spiderweb bolometers with a superconducting transition edge thermometer combine a high sensitivity and absorption efficiency for far infrared and sub-mm radiation with a low susceptibility to high energetic particles. They are among the most promising detectors today for future astronomy applications. In this paper we present our fabrication process for a fully integrated bolometer consisting of absorber, thermometer and suspension structure, based on micromachining of a silicon nitride membrane and various thin film deposition and etching steps. The optimization of Ti/Au transition edge thermometers is described, as well as electrical measurements on a fully integrated bolometer, indicating an electrical noise equivalent power of 2×10 -17 W/vHz at an operating temperature of 270 mK.
Kiewiet, F. B., Bruijn, M. P., Hoevers, H. F. C., Bento, A. C., Mels, W. A., & Korte de, P. A. J. (1999). Fabrication and characterization of infrared and sub-mm spiderweb bolometers with low Tc superconducting transition edge thermometers. IEEE Transactions on Applied Superconductivity, 9(2-3), 3862-3865. https://doi.org/10.1109/77.783870